/Engine/Source/Runtime/Interchange/Core/Public/Nodes/InterchangeBaseNodeContainer.h
This function serialize the node container and all node sub-objects point by it. Out of process translator like fbx will dump a file containing this data and the editor will read the file and regenerate the container from the saved data.
void SerializeNodeContainerData ( [FArchive](API\Runtime\Core\Serialization\FArchive) & Ar )